Day Valley, CA climate
Day Valley has warm winters and pleasant summers. A typical July afternoon reaches 78°, a January night drops to 40°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Day Valley feels like
Winter
Spring
Summer
Fall
Day Valley weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 61° | 40° | 6.4" | 0 | 11 | 0 | 47° – 55° |
| February | 62° | 41° | 5.9" | 0 | 11 | 0 | 48° – 57° |
| March | 64° | 43° | 4.6" | 0 | 10 | 0 | 49° – 59° |
| April | 67° | 44° | 2.0" | 0 | 6 | 0 | 52° – 60° |
| May | 71° | 48° | 0.8" | 0 | 4 | 0 | 56° – 64° |
| June | 76° | 51° | 0.2" | 0 | 1 | 0 | 60° – 66° |
| July | 78° | 55° | 0.0" | 0 | 1 | 0 | 63° – 70° |
| August | 79° | 55° | 0.0" | 0 | 1 | 0 | 65° – 72° |
| September | 79° | 54° | 0.1" | 0 | 1 | 0 | 63° – 71° |
| October | 75° | 49° | 1.2" | 0 | 4 | 0 | 59° – 67° |
| November | 66° | 44° | 3.1" | 0 | 7 | 0 | 48° – 58° |
| December | 60° | 40° | 6.2" | 0 | 10 | 0 | 46° – 53° |
| Year | 70° | 47° | 30.5" | 0.0" | 65 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Day Valley
Day Valley gets 31 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 65 days a year.
About 323 frost-free days a year
In half of years the last 32° night comes by January 29 and the first one by December 13. That leaves about 323 frost-free days for gardens, longer than 96% of U.S. towns.
Heating and cooling a home in Day Valley
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Day Valley, 93% of that work is heating and 7% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Day Valley and its neighbors
Day Valley borders 4 towns with climate data. January nights across them vary by 1.9°. Corralitos has both the coldest January nights (40°) and the hottest July afternoons (80°). Day Valley’s January low is 40° and its July high 78°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Day Valley compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Day Valley averaged 1.8° warmer than the 1900s. The biggest change is in January (+2.7°). The shift is larger than in 89% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Day Valley’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 49° to 59°. June is the most reliable, staying within 6°.
Common questions about Day Valley’s climate
What is the coldest month in Day Valley?
December, with a typical high of 60° and a low of 40°.
What is the hottest month in Day Valley?
August, with a typical high of 79° and a low of 55°. About 6 days a year reach 90°.
How much snow does Day Valley get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Day Valley?
In half of years the first 32° night comes by December 13, and the last spring frost by January 29.
What is the rainiest month in Day Valley?
January, with 6.4 inches of rain and melted snow. The year totals 31 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Day Valley itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Santa Cruz, CA (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.